US2675362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polymerization of styrene
Assignee: Monsanto Chemicals Ltd
•
Filing: 1952-01-12
•
Granted: 1954-04-13
•
Expires: 1972-01-12
Abstract
No abstract record available.
Inventors
- 👤 Shusman Tevis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:07
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR THE MASS POLYMERIZATION OF STYRENE WHICH COMPRISES DISSOLVING FROM 0.03 TO 0 PART OF A PEROXY COMPOUND AND A CORRESPONDINGLY FROM 0.1 TO 0.6 PART OF A SATURATED ALIPHATIC ACID CONTAINING FROM 12 TO 20 CARBON ATOMS IN 100 PARTS OF STYRENE MONOMER, HEATING THE MONOMER AT 85-95* C. UNTIL 25-30% CONVERSION TO POLYMER IS OBTAINED, THEN RAISING THE TEMPERATURE GRADUALLY TO 170-190* C. OVER A PERIOD OF 4 TO 5 HOURS AND FINALLY HEATING THE REACTION AT 170-190* C. FOR FROM 3 TO 5 HOURS, SAID PEROXY COMPOUND BEING TAKEN FROM THE GROUP CONSISTING OF DIALKYL PEROXIDES, ALKYL PERBENZOATES AND ALKYL PERACETATES.
Claim 2
Dependent Claim
106 words
A PROCESS FOR THE MASS POLYMERIZATION OF STYRENE WHICH COMPRISES DISSOLVING FROM 0.03 TO 0 PART OF A PEROXY COMPOUND AND A CORRESPONDINGLY FROM 0.1 TO 0.6 PART OF A SATURATED ALIPHATIC ACID CONTAINING FROM 12 TO 20 CARBON ATOMS IN 100 PARTS OF STYRENE MONOMER, HEATING THE MONOMER AT 85-95* C. UNTIL 25-30% CONVERSION TO POLYMER IS OBTAINED, THEN RAISING THE TEMPERATURE GRADUALLY TO 170-190* C. OVER A PERIOD OF 4 TO 5 HOURS AND FINALLY HEATING THE REACTION AT 170-190* C. FOR FROM 3 TO 5 HOURS, SAID PEROXY COMPOUND BEING TAKEN FROM THE GROUP CONSISTING OF DIALKYL PEROXIDES, ALKYL PERBENZOATES AND ALKYL PERACETATES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |